Welcome to the Water Treatment Operator 50 Question Practice Test.
Choose the best possible answer to the question.
1.
Fluoride concentration above what mg/L will likely cause teeth to become pitted?
2.
What percentage of the earth's surface is covered in water?
3.
A composite sample should never be collected for what type of analysis?
4.
What would have the least impact on the efficiency of copper sulfate?
5.
The actions levels for lead and copper are?
6.
The scattering of light by the particles in finished water is from the turbidity caused by
7.
Where are the two points on a gravity filter used to measure head loss located?
8.
Vegetation control in and around reservoirs is practiced to control the release of chemical compounds that
9.
Impurities that do not dissolve in water and settle out eventually are?
10.
If the continuous monitoring of the residual disinfectant concentration of the water entering the water system fails, how often will an operator need to collect a grab sample until the problem is fixed?
11.
In order to prevent air binding in a rapid sand filter, head loss should never exceed?
12.
Which forces will pull particles together once they have been destabilized in the coagulation-flocculation process?
13.
When natural zeolites are used for softening and they have become exhausted from use, what chemical are they regenerated with?
14.
The fusible metal plugs on chlorine containers are designed to melt at what temperatures?
15.
What is the purpose of body feed in the operation of a diatomaceous earth filter?
16.
The chemical combination for substances in solution so as to cause separation in the insoluble form can be described as?
17.
At minimum, the Surface Water Treatment Rule requires surface water users to use what two treatment methods?
18.
Direct filtration eliminates what conventional treatment step?
19.
Typically, how long is the flash mixing time in the coagulation process?
20.
What is the best addition for water that is highly colored due to organic matter?
21.
What will ion exchange remove?
22.
The proper emergency kit for a TON chlorine cylinder is?
23.
Where is the least desirable point in a plug flow sedimentation basin for turbulent flow that resuspends solids would be in the?
24.
A 50% solution of caustic soda will begin to crystallize if the temperature drops below?
25.
What chemical can be created by certain bacterial organisms and accelerate the corrosion process?
26.
When disinfecting a well with free chlorine, what is the required exposure time and what must the concentration be?
27.
What is the only MCL that varies with the temperature?
28.
What type of self-contained breathing apparatus should be used at water plants?
29.
Protozoa are larger than bacteria which are larger than viruses.
30.
Low temperature water can be compensated for when using Alum by?
31.
Which is the method for testing for total coliform bacteria?
32.
Which natural electrical force keeps colloidal particles apart in water treatment?
33.
What is the most troublesome operating problem for a sedimentation basin?
34.
The treatment process that controls corrosion or scaling is known as?
35.
To unclog the head of a chemical feed pump an operator should first?
37.
Current regulations require that water treatment wastes be monitored?
38.
What is dental fluorosis?
39.
Lead contamination in drinking water may cause children to have altered physical and mental developments.
40.
A connection between a potable water system and a non potable water system is?
41.
Most totalizer meters at treatment plants are commonly
42.
In which state are Giardia most vulnerable to inactivation through disinfection?
43.
What is used as part of a sedimentation basin to allow a controlled flow of the supernatant to be collected and directed to the filter beds?
44.
Reservoir turnover events cause by temperature changes reduce what at deeper water levels?
45.
What chemical oxidant would be most effective for controlling biological growth?
46.
What process is considered to best to remove color from water in a conventional surface water treatment plant?
47.
Settled backwash water that is recovered and re-used from a conventional surface water filtration plant should be returned to the beginning of the treatment train.
48.
When treating surface water, the main reason for removing solids is?
49.
What is the natural attraction between particles that can be used to collect them into larger groups once destabilization has occurred?
50.
What is the minimum angle that self cleaning tube settlers must be placed?
